Prevent certain post to autopost to facebook

Hi,
We just created our fanpage and installed ultimate facebook. For the most part, it's working as expected.
However, I found that when I edit old posts in my blog (that is not on our fanpage yet), the post will automatically be post to facebook. I don't want these posts on facebook because it's outdated. We are only doing the editing for SEO reasons. Now after I finished editing each post, I have to go to our fanpage to delete the autopost manually.
How do I prevent this?
Is there an option to do this somewhere that I missed?

Thank you!